"Otherland" is a science fiction series written by Tad Williams. It consists of four main novels published between 1996 and 2001, exploring a vast virtual reality world where users can experience different realms and adventures. The story follows a group of characters who navigate this complex digital landscape while uncovering a deeper mystery that connects their lives. The series delves into themes of technology, identity, and the nature of reality. It combines elements of fantasy and cyberpunk, drawing comparisons to other works in the genre, such as Neuromancer by William Gibson and Ready Player One by Ernest Cline.